Add "Review Quick Search" feature

Available on every Critic page via the keyboard short-cut 'f'.  Also
integrated help via a link to a short tutorial page.  Displays search
results in a dialog in the page.
Ensure installed files are owned correctly during upgrade

Installed files created or updated during an upgrade would earlier end up
being owned by root instead of by the Critic system user/group.  This
prevents that, and also fixes current incorrect file modes or ownership
for all installed files.
Reimplement /search based on the new /reviewsearch operation

Also add a note on /search mentioning the existence of the review quick
search feature (the F keyboard short-cut.)